diff --git a/fdbserver/KeyValueStoreMemory.actor.cpp b/fdbserver/KeyValueStoreMemory.actor.cpp
index e3b768d421b..99e2ed4b476 100644
--- a/fdbserver/KeyValueStoreMemory.actor.cpp
+++ b/fdbserver/KeyValueStoreMemory.actor.cpp
@@ -83,10 +83,12 @@ class KeyValueStoreMemory : public IKeyValueStore, NonCopyable {
 		int64_t uncommittedBytes = queue.totalSize() + transactionSize;
 
 		//Check that we have enough space in memory and on disk
-		int64_t availableSize = std::min(getAvailableSize(), diskQueueBytes.free / 4 - uncommittedBytes);
+		int64_t freeSize = std::min(getAvailableSize(), diskQueueBytes.free / 4 - uncommittedBytes);
+		int64_t availableSize = std::min(getAvailableSize(), diskQueueBytes.available / 4 - uncommittedBytes);
 		int64_t totalSize = std::min(memoryLimit, diskQueueBytes.total / 4 - uncommittedBytes);
 
-		return StorageBytes(std::max((int64_t)0, availableSize), std::max((int64_t)0, totalSize), diskQueueBytes.used, diskQueueBytes.available);
+		return StorageBytes(std::max((int64_t)0, freeSize), std::max((int64_t)0, totalSize), diskQueueBytes.used,
+		    std::max((int64_t)0, availableSize));
 	}
 
 	void semiCommit() {